This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

An intricate and amazing house built by architect Karl Junker.

The world's largest model of our planetary system.

A self-taught Siberian craftsman creates a fantastical and personal design for his 19th century village house.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

A cave covered with bizarre stalactites of cloth.

Founded as a refugee camp, now a popular tourist spot.

Inhospitable caverns just beneath this island paradise offer insights into alien worlds.

Ancient rock-hewn town that witnessed key events of Georgian history.

Extraordinary animals sculpted from leftover junk.